The tax boss will pay his first visit to the Oversight Committee, plus the grad-student debt bomb.

WHO'S IN CHARGE HERE? John Koskinen, three months into his job as IRS commissioner, will make his first visit to the House Oversight Committee on Wednesday. Mr. Koskinen will testify on his agency's illegal targeting of conservative organizations beginning around 2010, as well as a pending IRS rule-making that will codify limits on political speech by such organizations. One potentially interesting line of questioning will involve what discussions he had with the Obama Administration about the targeting before and after he was hired last December. When questioned in February about the pending IRS rules, Mr....